Coupons

Coupons work very much like a regular product, but they reduce the totals instead of increasing them.

Smart Transaction

{
    // ...
    "basket": {
        "products": [ 
            {
                "item_type": "sub_transaction",
                // ...
                "sub_basket": [
                    // ...
                    {
                        "id": 2,
                        "item_type": "coupon",
                        "desc": "Coupon €10",
                        "quantity": 1,
                        "priceOne": 1000,
                        "tax": 0
                    },
                    // ...
                ]
            }
        ]
    },
    // ...
}

These are the fields:

Attribute	Type	Description
`item_type`	`string`	Must be `coupon`.
`id`	`int`	Unique ID as handle for later changes.
`desc`	`string`	Coupon name.
`quantity`	`number`	Item count (usually `1`).
`priceOne`	`number`	Gross unit amount. This is the value of the coupon.
`tax`	`number`	The value-added tax (VAT) rate in percent (usually `0`).